I've mostly just operated marine commercial navigation radars, but having said that, I wouldn't expect the return to be very good. You would still have reflecte

I've mostly just operated marine commercial navigation radars, but having said that, I wouldn't expect the return to be very good. You would still have reflected energy, but it would be much closer to noise, so it would have to be much closer to be automatically detected, or even to be detectable on screen by my own observation. A tracker assigned to it certainly wouldn't maintain itself.